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2. Numismatic Guaranty Company - Wikipedia

   en.wikipedia.org/wiki/Numismatic_Guaranty_Company

   Numismatic Guaranty Company (NGC) is an international third-party coin grading and certification service based in Sarasota, Florida. It has certified more than 60 million coins. NGC certification consists of authentication, grading, attribution, and encapsulation in clear plastic holders. NGC is a subsidiary of Certified Collectibles Group (CCG ...

3. Professional Coin Grading Service - Wikipedia

   en.wikipedia.org/wiki/Professional_Coin_Grading...

   Professional Coin Grading Service (PCGS) is an American third-party coin grading, authentication, attribution, and encapsulation service founded in 1985. The intent of its seven founding dealers, including the firm's former president David Hall, was to standardize grading. [4][5] The firm has divisions in Europe and Asia, and is owned by parent ...

4. Yuan Shikai coinage - Wikipedia

   en.wikipedia.org/wiki/Yuan_Shikai_coinage

   This led to a shortage of foreign silver coins (chiefly the Mexican peso), and the Yuan Shikai dollar quickly replaced it as the primary trade coin within China. In 1924, a Bank of Shanghai investigation found that the Yuan Shikai dollar had emerged as the primary form of currency in 47 out of 48 cities studied; the sole exception was Japanese ...

5. Coins of the Swiss franc - Wikipedia

   en.wikipedia.org/wiki/Coins_of_the_Swiss_franc

   The 5-franc coin of 90% silver was unlimited legal tender together with gold, while 2-, 1,- and 1 ⁄ 2-franc coins of 83.5% silver were made subsidiary or limited legal tender. The billon coins (5% to 15% silver) were also subsidiary; they were replaced by Cupronickel and Nickel in 1879. In 1918/19, there was experimentation with brass (Cu ...

6. Coinage Act of 1857 - Wikipedia

   en.wikipedia.org/wiki/Coinage_Act_of_1857

   The Coinage Act of 1857 repealed prior legal tender laws concerning foreign specie. It fixed the weight and measure of US one-cent pieces at 4.655 grams, which was composed of 88% copper and 12% nickel. It also mandated that this new copper/nickel alloy be received as payment for the worn gold and silver coins turned in at the mint.

7. Coin grading - Wikipedia

   en.wikipedia.org/wiki/Coin_grading

   Coin grading. Coin grading[1] is the process of determining the grade or condition of a coin, one of the key factors in determining its collectible value. A coin's grade is generally determined by six criteria: strike, preservation, luster, color, attractiveness, and occasionally the country/state in which it was minted.